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Glitch-free clock switching circuit

Active Publication Date: 2008-10-23
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0002]The invention relates to a clock switching circuit, and in particular relates to a glitch-free clock switching circuit and method thereof.

Problems solved by technology

As a result, one important issue for integrated circuit designers is the control of power consumption, of which, the clock switching circuit plays an important role.
However, if clock signals CLK_A and CLK_B have different voltage levels, when the multiplexer switches, the multiplexer will generate glitch signals.
The pulse signal causes synchronization failure or lost of data, and may even cause system failure.

Method used

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Embodiment Construction

[0015]The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0016]FIG. 3 shows a clock switching circuit 200 according to an embodiment of the invention. The clock switching circuit 200 comprises a clock switching control device 210, an AND logic gate 296, a multiplexer 260, clock gate control units 230 and 250, and synchronization devices 221 and 222. The clock switching circuit 200 receives a first clock signal clk_a and a second clock signal clk_b and outputs a third clock clk_a_gated signal or a fourth clock signal clk_b_gated as a clock output signal clk_out according to a clock switching signal. The third clock signal clk_a_gated corresponds to the first clock signal clk_a and the fourth clock signal clk_b_gated correspon...

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PUM

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Abstract

A glitch-free clock switching circuit receives a first clock signal and a second clock signal and outputs a third clock signal corresponding to the first clock signal or a fourth clock signal corresponding to the second clock signal according to a clock switching signal. The glitch-free clock switching circuit switches to output clock signals by stopping output of a clock signal, and then waiting for a predetermined period of time before outputting another clock signal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to a clock switching circuit, and in particular relates to a glitch-free clock switching circuit and method thereof.[0003]2. Description of the Related Art[0004]Due to improved integrated circuit technology, increased integrated circuit application and consumer demand, more and more circuits are being required within an integrated circuit. As a result, one important issue for integrated circuit designers is the control of power consumption, of which, the clock switching circuit plays an important role. Generally, computer systems or communication systems have a plurality of clock signals with different frequencies. For example, some applications require very high frequency signals and other applications require low frequency signals. Thus, to efficiently control system performance and power consumption, the system usually uses clock switching circuits to change different clock signal frequencies fo...

Claims

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Application Information

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IPC IPC(8): G06F1/04H03K3/00
CPCG06F1/04
Inventor GAO, PENGLI, DEJIANHUANG, YU
Owner VIA TECH INC